{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2019-10-09T11:05:52.370971Z",
     "start_time": "2019-10-09T11:05:51.739445Z"
    }
   },
   "outputs": [],
   "source": [
    "import pandas as pd\n",
    "import numpy as np\n",
    "import altair as alt\n",
    "\n",
    "DATE_TIME = \"date/time\"\n",
    "DATA_URL = (\n",
    "    \"/pi/ai/code/uber-raw-data-sep14.csv.gz\"\n",
    ")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2019-10-09T11:14:15.971157Z",
     "start_time": "2019-10-09T11:14:15.963005Z"
    }
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'3.2.0'"
      ]
     },
     "execution_count": 2,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "import altair as alt\n",
    "alt.__version__"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2019-10-09T11:14:19.190146Z",
     "start_time": "2019-10-09T11:14:19.180479Z"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "default\n"
     ]
    }
   ],
   "source": [
    "print(alt.renderers.active)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2019-10-09T11:07:06.136577Z",
     "start_time": "2019-10-09T11:07:06.124840Z"
    }
   },
   "outputs": [],
   "source": [
    "def load_data(nrows):\n",
    "    data = pd.read_csv(DATA_URL, nrows=nrows)\n",
    "    lowercase = lambda x: str(x).lower()\n",
    "    data.rename(lowercase, axis=\"columns\", inplace=True)\n",
    "    data[DATE_TIME] = pd.to_datetime(data[DATE_TIME])\n",
    "    return data"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2019-10-09T11:07:19.433163Z",
     "start_time": "2019-10-09T11:07:07.995791Z"
    }
   },
   "outputs": [],
   "source": [
    "data = load_data(100000)\n",
    "hour=6\n",
    "data = data[data[DATE_TIME].dt.hour == hour]\n",
    "filtered = data[\n",
    "    (data[DATE_TIME].dt.hour >= hour) & (data[DATE_TIME].dt.hour < (hour + 1))\n",
    "]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2019-10-09T11:07:30.564862Z",
     "start_time": "2019-10-09T11:07:30.551661Z"
    }
   },
   "outputs": [],
   "source": [
    "hist = np.histogram(filtered[DATE_TIME].dt.minute, bins=60, range=(0, 60))[0]\n",
    "chart_data = pd.DataFrame({\"minute\": range(60), \"pickups\": hist})"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2019-10-09T11:08:04.275215Z",
     "start_time": "2019-10-09T11:08:04.183692Z"
    }
   },
   "outputs": [
    {
     "data": {
      "application/vnd.vegalite.v3+json": {
       "$schema": "https://vega.github.io/schema/vega-lite/v3.4.0.json",
       "config": {
        "mark": {
         "tooltip": null
        },
        "view": {
         "height": 300,
         "width": 400
        }
       },
       "data": {
        "name": "data-1e79450114bb55afd37042d954a8de95"
       },
       "datasets": {
        "data-1e79450114bb55afd37042d954a8de95": [
         {
          "minute": 0,
          "pickups": 35
         },
         {
          "minute": 1,
          "pickups": 41
         },
         {
          "minute": 2,
          "pickups": 43
         },
         {
          "minute": 3,
          "pickups": 39
         },
         {
          "minute": 4,
          "pickups": 37
         },
         {
          "minute": 5,
          "pickups": 40
         },
         {
          "minute": 6,
          "pickups": 38
         },
         {
          "minute": 7,
          "pickups": 48
         },
         {
          "minute": 8,
          "pickups": 36
         },
         {
          "minute": 9,
          "pickups": 36
         },
         {
          "minute": 10,
          "pickups": 42
         },
         {
          "minute": 11,
          "pickups": 51
         },
         {
          "minute": 12,
          "pickups": 46
         },
         {
          "minute": 13,
          "pickups": 36
         },
         {
          "minute": 14,
          "pickups": 42
         },
         {
          "minute": 15,
          "pickups": 56
         },
         {
          "minute": 16,
          "pickups": 50
         },
         {
          "minute": 17,
          "pickups": 59
         },
         {
          "minute": 18,
          "pickups": 54
         },
         {
          "minute": 19,
          "pickups": 48
         },
         {
          "minute": 20,
          "pickups": 47
         },
         {
          "minute": 21,
          "pickups": 61
         },
         {
          "minute": 22,
          "pickups": 60
         },
         {
          "minute": 23,
          "pickups": 59
         },
         {
          "minute": 24,
          "pickups": 63
         },
         {
          "minute": 25,
          "pickups": 56
         },
         {
          "minute": 26,
          "pickups": 52
         },
         {
          "minute": 27,
          "pickups": 70
         },
         {
          "minute": 28,
          "pickups": 47
         },
         {
          "minute": 29,
          "pickups": 55
         },
         {
          "minute": 30,
          "pickups": 53
         },
         {
          "minute": 31,
          "pickups": 55
         },
         {
          "minute": 32,
          "pickups": 52
         },
         {
          "minute": 33,
          "pickups": 60
         },
         {
          "minute": 34,
          "pickups": 46
         },
         {
          "minute": 35,
          "pickups": 56
         },
         {
          "minute": 36,
          "pickups": 51
         },
         {
          "minute": 37,
          "pickups": 61
         },
         {
          "minute": 38,
          "pickups": 62
         },
         {
          "minute": 39,
          "pickups": 49
         },
         {
          "minute": 40,
          "pickups": 50
         },
         {
          "minute": 41,
          "pickups": 52
         },
         {
          "minute": 42,
          "pickups": 65
         },
         {
          "minute": 43,
          "pickups": 52
         },
         {
          "minute": 44,
          "pickups": 48
         },
         {
          "minute": 45,
          "pickups": 49
         },
         {
          "minute": 46,
          "pickups": 62
         },
         {
          "minute": 47,
          "pickups": 64
         },
         {
          "minute": 48,
          "pickups": 59
         },
         {
          "minute": 49,
          "pickups": 68
         },
         {
          "minute": 50,
          "pickups": 72
         },
         {
          "minute": 51,
          "pickups": 55
         },
         {
          "minute": 52,
          "pickups": 66
         },
         {
          "minute": 53,
          "pickups": 60
         },
         {
          "minute": 54,
          "pickups": 56
         },
         {
          "minute": 55,
          "pickups": 61
         },
         {
          "minute": 56,
          "pickups": 71
         },
         {
          "minute": 57,
          "pickups": 64
         },
         {
          "minute": 58,
          "pickups": 56
         },
         {
          "minute": 59,
          "pickups": 63
         }
        ]
       },
       "encoding": {
        "tooltip": [
         {
          "field": "minute",
          "type": "quantitative"
         },
         {
          "field": "pickups",
          "type": "quantitative"
         }
        ],
        "x": {
         "field": "minute",
         "scale": {
          "nice": false
         },
         "type": "quantitative"
        },
        "y": {
         "field": "pickups",
         "type": "quantitative"
        }
       },
       "height": 150,
       "mark": {
        "interpolate": "step-after",
        "line": true,
        "type": "area"
       }
      },
      "text/plain": [
       "<VegaLite 3 object>\n",
       "\n",
       "If you see this message, it means the renderer has not been properly enabled\n",
       "for the frontend that you are using. For more information, see\n",
       "https://altair-viz.github.io/user_guide/troubleshooting.html\n"
      ]
     },
     "execution_count": 7,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "alt.Chart(chart_data, height=150) \\\n",
    "    .mark_area(\n",
    "        interpolate='step-after',\n",
    "        line=True\n",
    "    ).encode(\n",
    "        x=alt.X(\"minute:Q\", scale=alt.Scale(nice=False)),\n",
    "        y=alt.Y(\"pickups:Q\"),\n",
    "        tooltip=['minute', 'pickups']\n",
    "    )"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2019-10-09T11:12:06.217239Z",
     "start_time": "2019-10-09T11:12:06.211890Z"
    }
   },
   "outputs": [],
   "source": [
    "# alt.Chart({\n",
    "#   data: 'https://vega.github.io/vega-datasets/data/cars.json',\n",
    "#   encoding: FacetedEncoding({\n",
    "#     x: X({\n",
    "#       shorthand: 'Horsepower'\n",
    "#     })\n",
    "#   }),\n",
    "#   mark: 'point'\n",
    "# })"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2019-10-09T11:14:10.419056Z",
     "start_time": "2019-10-09T11:14:09.656914Z"
    }
   },
   "outputs": [
    {
     "data": {
      "application/vnd.vegalite.v3+json": {
       "$schema": "https://vega.github.io/schema/vega-lite/v3.4.0.json",
       "config": {
        "mark": {
         "tooltip": null
        },
        "view": {
         "height": 300,
         "width": 400
        }
       },
       "data": {
        "url": "nonexistent_file.csv"
       },
       "encoding": {
        "x": {
         "field": "x",
         "type": "quantitative"
        },
        "y": {
         "field": "y",
         "type": "quantitative"
        }
       },
       "mark": "line"
      },
      "text/plain": [
       "<VegaLite 3 object>\n",
       "\n",
       "If you see this message, it means the renderer has not been properly enabled\n",
       "for the frontend that you are using. For more information, see\n",
       "https://altair-viz.github.io/user_guide/troubleshooting.html\n"
      ]
     },
     "execution_count": 1,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "import altair as alt\n",
    "\n",
    "alt.Chart('nonexistent_file.csv').mark_line().encode(\n",
    "    x='x:Q',\n",
    "    y='y:Q',\n",
    ")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2019-10-09T11:23:35.185549Z",
     "start_time": "2019-10-09T11:23:34.446715Z"
    }
   },
   "outputs": [
    {
     "data": {
      "application/vnd.vegalite.v3+json": {
       "$schema": "https://vega.github.io/schema/vega-lite/v3.4.0.json",
       "config": {
        "mark": {
         "tooltip": null
        },
        "view": {
         "height": 300,
         "width": 400
        }
       },
       "data": {
        "name": "data-f02450ab61490a1363517a0190416235"
       },
       "datasets": {
        "data-f02450ab61490a1363517a0190416235": [
         {
          "Acceleration": 12,
          "Cylinders": 8,
          "Displacement": 307,
          "Horsepower": 130,
          "Miles_per_Gallon": 18,
          "Name": "chevrolet chevelle malibu",
          "Origin": "USA",
          "Weight_in_lbs": 3504,
          "Year": "1970-01-01T00:00:00"
         },
         {
          "Acceleration": 11.5,
          "Cylinders": 8,
          "Displacement": 350,
          "Horsepower": 165,
          "Miles_per_Gallon": 15,
          "Name": "buick skylark 320",
          "Origin": "USA",
          "Weight_in_lbs": 3693,
          "Year": "1970-01-01T00:00:00"
         },
         {
          "Acceleration": 11,
          "Cylinders": 8,
          "Displacement": 318,
          "Horsepower": 150,
          "Miles_per_Gallon": 18,
          "Name": "plymouth satellite",
          "Origin": "USA",
          "Weight_in_lbs": 3436,
          "Year": "1970-01-01T00:00:00"
         },
         {
          "Acceleration": 12,
          "Cylinders": 8,
          "Displacement": 304,
          "Horsepower": 150,
          "Miles_per_Gallon": 16,
          "Name": "amc rebel sst",
          "Origin": "USA",
          "Weight_in_lbs": 3433,
          "Year": "1970-01-01T00:00:00"
         },
         {
          "Acceleration": 10.5,
          "Cylinders": 8,
          "Displacement": 302,
          "Horsepower": 140,
          "Miles_per_Gallon": 17,
          "Name": "ford torino",
          "Origin": "USA",
          "Weight_in_lbs": 3449,
          "Year": "1970-01-01T00:00:00"
         },
         {
          "Acceleration": 10,
          "Cylinders": 8,
          "Displacement": 429,
          "Horsepower": 198,
          "Miles_per_Gallon": 15,
          "Name": "ford galaxie 500",
          "Origin": "USA",
          "Weight_in_lbs": 4341,
          "Year": "1970-01-01T00:00:00"
         },
         {
          "Acceleration": 9,
          "Cylinders": 8,
          "Displacement": 454,
          "Horsepower": 220,
          "Miles_per_Gallon": 14,
          "Name": "chevrolet impala",
          "Origin": "USA",
          "Weight_in_lbs": 4354,
          "Year": "1970-01-01T00:00:00"
         },
         {
          "Acceleration": 8.5,
          "Cylinders": 8,
          "Displacement": 440,
          "Horsepower": 215,
          "Miles_per_Gallon": 14,
          "Name": "plymouth fury iii",
          "Origin": "USA",
          "Weight_in_lbs": 4312,
          "Year": "1970-01-01T00:00:00"
         },
         {
          "Acceleration": 10,
          "Cylinders": 8,
          "Displacement": 455,
          "Horsepower": 225,
          "Miles_per_Gallon": 14,
          "Name": "pontiac catalina",
          "Origin": "USA",
          "Weight_in_lbs": 4425,
          "Year": "1970-01-01T00:00:00"
         },
         {
          "Acceleration": 8.5,
          "Cylinders": 8,
          "Displacement": 390,
          "Horsepower": 190,
          "Miles_per_Gallon": 15,
          "Name": "amc ambassador dpl",
          "Origin": "USA",
          "Weight_in_lbs": 3850,
          "Year": "1970-01-01T00:00:00"
         },
         {
          "Acceleration": 17.5,
          "Cylinders": 4,
          "Displacement": 133,
          "Horsepower": 115,
          "Miles_per_Gallon": null,
          "Name": "citroen ds-21 pallas",
          "Origin": "Europe",
          "Weight_in_lbs": 3090,
          "Year": "1970-01-01T00:00:00"
         },
         {
          "Acceleration": 11.5,
          "Cylinders": 8,
          "Displacement": 350,
          "Horsepower": 165,
          "Miles_per_Gallon": null,
          "Name": "chevrolet chevelle concours (sw)",
          "Origin": "USA",
          "Weight_in_lbs": 4142,
          "Year": "1970-01-01T00:00:00"
         },
         {
          "Acceleration": 11,
          "Cylinders": 8,
          "Displacement": 351,
          "Horsepower": 153,
          "Miles_per_Gallon": null,
          "Name": "ford torino (sw)",
          "Origin": "USA",
          "Weight_in_lbs": 4034,
          "Year": "1970-01-01T00:00:00"
         },
         {
          "Acceleration": 10.5,
          "Cylinders": 8,
          "Displacement": 383,
          "Horsepower": 175,
          "Miles_per_Gallon": null,
          "Name": "plymouth satellite (sw)",
          "Origin": "USA",
          "Weight_in_lbs": 4166,
          "Year": "1970-01-01T00:00:00"
         },
         {
          "Acceleration": 11,
          "Cylinders": 8,
          "Displacement": 360,
          "Horsepower": 175,
          "Miles_per_Gallon": null,
          "Name": "amc rebel sst (sw)",
          "Origin": "USA",
          "Weight_in_lbs": 3850,
          "Year": "1970-01-01T00:00:00"
         },
         {
          "Acceleration": 10,
          "Cylinders": 8,
          "Displacement": 383,
          "Horsepower": 170,
          "Miles_per_Gallon": 15,
          "Name": "dodge challenger se",
          "Origin": "USA",
          "Weight_in_lbs": 3563,
          "Year": "1970-01-01T00:00:00"
         },
         {
          "Acceleration": 8,
          "Cylinders": 8,
          "Displacement": 340,
          "Horsepower": 160,
          "Miles_per_Gallon": 14,
          "Name": "plymouth 'cuda 340",
          "Origin": "USA",
          "Weight_in_lbs": 3609,
          "Year": "1970-01-01T00:00:00"
         },
         {
          "Acceleration": 8,
          "Cylinders": 8,
          "Displacement": 302,
          "Horsepower": 140,
          "Miles_per_Gallon": null,
          "Name": "ford mustang boss 302",
          "Origin": "USA",
          "Weight_in_lbs": 3353,
          "Year": "1970-01-01T00:00:00"
         },
         {
          "Acceleration": 9.5,
          "Cylinders": 8,
          "Displacement": 400,
          "Horsepower": 150,
          "Miles_per_Gallon": 15,
          "Name": "chevrolet monte carlo",
          "Origin": "USA",
          "Weight_in_lbs": 3761,
          "Year": "1970-01-01T00:00:00"
         },
         {
          "Acceleration": 10,
          "Cylinders": 8,
          "Displacement": 455,
          "Horsepower": 225,
          "Miles_per_Gallon": 14,
          "Name": "buick estate wagon (sw)",
          "Origin": "USA",
          "Weight_in_lbs": 3086,
          "Year": "1970-01-01T00:00:00"
         },
         {
          "Acceleration": 15,
          "Cylinders": 4,
          "Displacement": 113,
          "Horsepower": 95,
          "Miles_per_Gallon": 24,
          "Name": "toyota corona mark ii",
          "Origin": "Japan",
          "Weight_in_lbs": 2372,
          "Year": "1970-01-01T00:00:00"
         },
         {
          "Acceleration": 15.5,
          "Cylinders": 6,
          "Displacement": 198,
          "Horsepower": 95,
          "Miles_per_Gallon": 22,
          "Name": "plymouth duster",
          "Origin": "USA",
          "Weight_in_lbs": 2833,
          "Year": "1970-01-01T00:00:00"
         },
         {
          "Acceleration": 15.5,
          "Cylinders": 6,
          "Displacement": 199,
          "Horsepower": 97,
          "Miles_per_Gallon": 18,
          "Name": "amc hornet",
          "Origin": "USA",
          "Weight_in_lbs": 2774,
          "Year": "1970-01-01T00:00:00"
         },
         {
          "Acceleration": 16,
          "Cylinders": 6,
          "Displacement": 200,
          "Horsepower": 85,
          "Miles_per_Gallon": 21,
          "Name": "ford maverick",
          "Origin": "USA",
          "Weight_in_lbs": 2587,
          "Year": "1970-01-01T00:00:00"
         },
         {
          "Acceleration": 14.5,
          "Cylinders": 4,
          "Displacement": 97,
          "Horsepower": 88,
          "Miles_per_Gallon": 27,
          "Name": "datsun pl510",
          "Origin": "Japan",
          "Weight_in_lbs": 2130,
          "Year": "1970-01-01T00:00:00"
         },
         {
          "Acceleration": 20.5,
          "Cylinders": 4,
          "Displacement": 97,
          "Horsepower": 46,
          "Miles_per_Gallon": 26,
          "Name": "volkswagen 1131 deluxe sedan",
          "Origin": "Europe",
          "Weight_in_lbs": 1835,
          "Year": "1970-01-01T00:00:00"
         },
         {
          "Acceleration": 17.5,
          "Cylinders": 4,
          "Displacement": 110,
          "Horsepower": 87,
          "Miles_per_Gallon": 25,
          "Name": "peugeot 504",
          "Origin": "Europe",
          "Weight_in_lbs": 2672,
          "Year": "1970-01-01T00:00:00"
         },
         {
          "Acceleration": 14.5,
          "Cylinders": 4,
          "Displacement": 107,
          "Horsepower": 90,
          "Miles_per_Gallon": 24,
          "Name": "audi 100 ls",
          "Origin": "Europe",
          "Weight_in_lbs": 2430,
          "Year": "1970-01-01T00:00:00"
         },
         {
          "Acceleration": 17.5,
          "Cylinders": 4,
          "Displacement": 104,
          "Horsepower": 95,
          "Miles_per_Gallon": 25,
          "Name": "saab 99e",
          "Origin": "Europe",
          "Weight_in_lbs": 2375,
          "Year": "1970-01-01T00:00:00"
         },
         {
          "Acceleration": 12.5,
          "Cylinders": 4,
          "Displacement": 121,
          "Horsepower": 113,
          "Miles_per_Gallon": 26,
          "Name": "bmw 2002",
          "Origin": "Europe",
          "Weight_in_lbs": 2234,
          "Year": "1970-01-01T00:00:00"
         },
         {
          "Acceleration": 15,
          "Cylinders": 6,
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          "Displacement": 351,
          "Horsepower": 149,
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         },
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          "Acceleration": 14.5,
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         },
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         },
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         },
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          "Acceleration": 17,
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         },
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          "Acceleration": 15.9,
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         },
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          "Acceleration": 16.4,
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         },
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          "Acceleration": 14.1,
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         },
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         },
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          "Acceleration": 14.4,
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         },
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         },
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         },
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          "Acceleration": 16.4,
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         },
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          "Acceleration": 15.5,
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         },
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          "Acceleration": 13.2,
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         },
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          "Acceleration": 12.8,
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         },
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         },
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          "Acceleration": 17.2,
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          "Year": "1978-01-01T00:00:00"
         },
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         },
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          "Acceleration": 16.7,
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         },
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         },
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         },
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          "Acceleration": 13.2,
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          "Horsepower": 145,
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         },
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         },
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          "Acceleration": 11.2,
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         },
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          "Year": "1978-01-01T00:00:00"
         },
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          "Miles_per_Gallon": 30,
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          "Year": "1978-01-01T00:00:00"
         },
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          "Year": "1978-01-01T00:00:00"
         },
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          "Year": "1978-01-01T00:00:00"
         },
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          "Year": "1978-01-01T00:00:00"
         },
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          "Year": "1978-01-01T00:00:00"
         },
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         },
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         },
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          "Year": "1978-01-01T00:00:00"
         },
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          "Horsepower": 103,
          "Miles_per_Gallon": 20.3,
          "Name": "audi 5000",
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          "Year": "1978-01-01T00:00:00"
         },
         {
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          "Horsepower": 125,
          "Miles_per_Gallon": 17,
          "Name": "volvo 264gl",
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          "Year": "1978-01-01T00:00:00"
         },
         {
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          "Horsepower": 115,
          "Miles_per_Gallon": 21.6,
          "Name": "saab 99gle",
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          "Year": "1978-01-01T00:00:00"
         },
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          "Horsepower": 133,
          "Miles_per_Gallon": 16.2,
          "Name": "peugeot 604sl",
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          "Year": "1978-01-01T00:00:00"
         },
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          "Acceleration": 14.9,
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          "Horsepower": 71,
          "Miles_per_Gallon": 31.5,
          "Name": "volkswagen scirocco",
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          "Weight_in_lbs": 1990,
          "Year": "1978-01-01T00:00:00"
         },
         {
          "Acceleration": 16.6,
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          "Horsepower": 68,
          "Miles_per_Gallon": 29.5,
          "Name": "honda Accelerationord lx",
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          "Year": "1978-01-01T00:00:00"
         },
         {
          "Acceleration": 15.4,
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          "Horsepower": 115,
          "Miles_per_Gallon": 21.5,
          "Name": "pontiac lemans v6",
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          "Year": "1979-01-01T00:00:00"
         },
         {
          "Acceleration": 18.2,
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          "Horsepower": 85,
          "Miles_per_Gallon": 19.8,
          "Name": "mercury zephyr 6",
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          "Year": "1979-01-01T00:00:00"
         },
         {
          "Acceleration": 17.3,
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          "Horsepower": 88,
          "Miles_per_Gallon": 22.3,
          "Name": "ford fairmont 4",
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          "Year": "1979-01-01T00:00:00"
         },
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          "Horsepower": 90,
          "Miles_per_Gallon": 20.2,
          "Name": "amc concord dl 6",
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          "Year": "1979-01-01T00:00:00"
         },
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          "Horsepower": 110,
          "Miles_per_Gallon": 20.6,
          "Name": "dodge aspen 6",
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          "Year": "1979-01-01T00:00:00"
         },
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          "Acceleration": 15.4,
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          "Horsepower": 130,
          "Miles_per_Gallon": 17,
          "Name": "chevrolet caprice classic",
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          "Year": "1979-01-01T00:00:00"
         },
         {
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          "Horsepower": 129,
          "Miles_per_Gallon": 17.6,
          "Name": "ford ltd landau",
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          "Year": "1979-01-01T00:00:00"
         },
         {
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          "Horsepower": 138,
          "Miles_per_Gallon": 16.5,
          "Name": "mercury grand marquis",
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          "Year": "1979-01-01T00:00:00"
         },
         {
          "Acceleration": 15.2,
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          "Horsepower": 135,
          "Miles_per_Gallon": 18.2,
          "Name": "dodge st. regis",
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          "Year": "1979-01-01T00:00:00"
         },
         {
          "Acceleration": 14.9,
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          "Horsepower": 155,
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          "Name": "buick estate wagon (sw)",
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          "Year": "1979-01-01T00:00:00"
         },
         {
          "Acceleration": 14.3,
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          "Horsepower": 142,
          "Miles_per_Gallon": 15.5,
          "Name": "ford country squire (sw)",
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          "Year": "1979-01-01T00:00:00"
         },
         {
          "Acceleration": 15,
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          "Horsepower": 125,
          "Miles_per_Gallon": 19.2,
          "Name": "chevrolet malibu classic (sw)",
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          "Year": "1979-01-01T00:00:00"
         },
         {
          "Acceleration": 13,
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          "Horsepower": 150,
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          "Name": "chrysler lebaron town @ country (sw)",
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          "Year": "1979-01-01T00:00:00"
         },
         {
          "Acceleration": 14,
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          "Displacement": 89,
          "Horsepower": 71,
          "Miles_per_Gallon": 31.9,
          "Name": "vw rabbit custom",
          "Origin": "Europe",
          "Weight_in_lbs": 1925,
          "Year": "1979-01-01T00:00:00"
         },
         {
          "Acceleration": 15.2,
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          "Displacement": 86,
          "Horsepower": 65,
          "Miles_per_Gallon": 34.1,
          "Name": "maxda glc deluxe",
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          "Weight_in_lbs": 1975,
          "Year": "1979-01-01T00:00:00"
         },
         {
          "Acceleration": 14.4,
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          "Displacement": 98,
          "Horsepower": 80,
          "Miles_per_Gallon": 35.7,
          "Name": "dodge colt hatchback custom",
          "Origin": "USA",
          "Weight_in_lbs": 1915,
          "Year": "1979-01-01T00:00:00"
         },
         {
          "Acceleration": 15,
          "Cylinders": 4,
          "Displacement": 121,
          "Horsepower": 80,
          "Miles_per_Gallon": 27.4,
          "Name": "amc spirit dl",
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          "Year": "1979-01-01T00:00:00"
         },
         {
          "Acceleration": 20.1,
          "Cylinders": 5,
          "Displacement": 183,
          "Horsepower": 77,
          "Miles_per_Gallon": 25.4,
          "Name": "mercedes benz 300d",
          "Origin": "Europe",
          "Weight_in_lbs": 3530,
          "Year": "1979-01-01T00:00:00"
         },
         {
          "Acceleration": 17.4,
          "Cylinders": 8,
          "Displacement": 350,
          "Horsepower": 125,
          "Miles_per_Gallon": 23,
          "Name": "cadillac eldorado",
          "Origin": "USA",
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          "Year": "1979-01-01T00:00:00"
         },
         {
          "Acceleration": 24.8,
          "Cylinders": 4,
          "Displacement": 141,
          "Horsepower": 71,
          "Miles_per_Gallon": 27.2,
          "Name": "peugeot 504",
          "Origin": "Europe",
          "Weight_in_lbs": 3190,
          "Year": "1979-01-01T00:00:00"
         },
         {
          "Acceleration": 22.2,
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         },
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         },
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         },
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         },
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         },
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         },
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         },
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         },
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         },
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         },
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         },
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         },
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         },
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         },
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         },
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         },
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          "Miles_per_Gallon": null,
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          "Year": "1982-01-01T00:00:00"
         },
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          "Year": "1982-01-01T00:00:00"
         },
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         },
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          "Year": "1982-01-01T00:00:00"
         },
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          "Miles_per_Gallon": 22.4,
          "Name": "buick century",
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          "Year": "1982-01-01T00:00:00"
         },
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          "Horsepower": 105,
          "Miles_per_Gallon": 26.6,
          "Name": "oldsmobile cutlass ls",
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          "Year": "1982-01-01T00:00:00"
         },
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          "Acceleration": 17.1,
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          "Horsepower": 88,
          "Miles_per_Gallon": 20.2,
          "Name": "ford granada gl",
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          "Year": "1982-01-01T00:00:00"
         },
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          "Acceleration": 16.6,
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          "Horsepower": 85,
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          "Name": "chrysler lebaron salon",
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          "Year": "1982-01-01T00:00:00"
         },
         {
          "Acceleration": 19.6,
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          "Horsepower": 88,
          "Miles_per_Gallon": 28,
          "Name": "chevrolet cavalier",
          "Origin": "USA",
          "Weight_in_lbs": 2605,
          "Year": "1982-01-01T00:00:00"
         },
         {
          "Acceleration": 18.6,
          "Cylinders": 4,
          "Displacement": 112,
          "Horsepower": 88,
          "Miles_per_Gallon": 27,
          "Name": "chevrolet cavalier wagon",
          "Origin": "USA",
          "Weight_in_lbs": 2640,
          "Year": "1982-01-01T00:00:00"
         },
         {
          "Acceleration": 18,
          "Cylinders": 4,
          "Displacement": 112,
          "Horsepower": 88,
          "Miles_per_Gallon": 34,
          "Name": "chevrolet cavalier 2-door",
          "Origin": "USA",
          "Weight_in_lbs": 2395,
          "Year": "1982-01-01T00:00:00"
         },
         {
          "Acceleration": 16.2,
          "Cylinders": 4,
          "Displacement": 112,
          "Horsepower": 85,
          "Miles_per_Gallon": 31,
          "Name": "pontiac j2000 se hatchback",
          "Origin": "USA",
          "Weight_in_lbs": 2575,
          "Year": "1982-01-01T00:00:00"
         },
         {
          "Acceleration": 16,
          "Cylinders": 4,
          "Displacement": 135,
          "Horsepower": 84,
          "Miles_per_Gallon": 29,
          "Name": "dodge aries se",
          "Origin": "USA",
          "Weight_in_lbs": 2525,
          "Year": "1982-01-01T00:00:00"
         },
         {
          "Acceleration": 18,
          "Cylinders": 4,
          "Displacement": 151,
          "Horsepower": 90,
          "Miles_per_Gallon": 27,
          "Name": "pontiac phoenix",
          "Origin": "USA",
          "Weight_in_lbs": 2735,
          "Year": "1982-01-01T00:00:00"
         },
         {
          "Acceleration": 16.4,
          "Cylinders": 4,
          "Displacement": 140,
          "Horsepower": 92,
          "Miles_per_Gallon": 24,
          "Name": "ford fairmont futura",
          "Origin": "USA",
          "Weight_in_lbs": 2865,
          "Year": "1982-01-01T00:00:00"
         },
         {
          "Acceleration": 20.5,
          "Cylinders": 4,
          "Displacement": 151,
          "Horsepower": null,
          "Miles_per_Gallon": 23,
          "Name": "amc concord dl",
          "Origin": "USA",
          "Weight_in_lbs": 3035,
          "Year": "1982-01-01T00:00:00"
         },
         {
          "Acceleration": 15.3,
          "Cylinders": 4,
          "Displacement": 105,
          "Horsepower": 74,
          "Miles_per_Gallon": 36,
          "Name": "volkswagen rabbit l",
          "Origin": "Europe",
          "Weight_in_lbs": 1980,
          "Year": "1982-01-01T00:00:00"
         },
         {
          "Acceleration": 18.2,
          "Cylinders": 4,
          "Displacement": 91,
          "Horsepower": 68,
          "Miles_per_Gallon": 37,
          "Name": "mazda glc custom l",
          "Origin": "Japan",
          "Weight_in_lbs": 2025,
          "Year": "1982-01-01T00:00:00"
         },
         {
          "Acceleration": 17.6,
          "Cylinders": 4,
          "Displacement": 91,
          "Horsepower": 68,
          "Miles_per_Gallon": 31,
          "Name": "mazda glc custom",
          "Origin": "Japan",
          "Weight_in_lbs": 1970,
          "Year": "1982-01-01T00:00:00"
         },
         {
          "Acceleration": 14.7,
          "Cylinders": 4,
          "Displacement": 105,
          "Horsepower": 63,
          "Miles_per_Gallon": 38,
          "Name": "plymouth horizon miser",
          "Origin": "USA",
          "Weight_in_lbs": 2125,
          "Year": "1982-01-01T00:00:00"
         },
         {
          "Acceleration": 17.3,
          "Cylinders": 4,
          "Displacement": 98,
          "Horsepower": 70,
          "Miles_per_Gallon": 36,
          "Name": "mercury lynx l",
          "Origin": "USA",
          "Weight_in_lbs": 2125,
          "Year": "1982-01-01T00:00:00"
         },
         {
          "Acceleration": 14.5,
          "Cylinders": 4,
          "Displacement": 120,
          "Horsepower": 88,
          "Miles_per_Gallon": 36,
          "Name": "nissan stanza xe",
          "Origin": "Japan",
          "Weight_in_lbs": 2160,
          "Year": "1982-01-01T00:00:00"
         },
         {
          "Acceleration": 14.5,
          "Cylinders": 4,
          "Displacement": 107,
          "Horsepower": 75,
          "Miles_per_Gallon": 36,
          "Name": "honda Accelerationord",
          "Origin": "Japan",
          "Weight_in_lbs": 2205,
          "Year": "1982-01-01T00:00:00"
         },
         {
          "Acceleration": 16.9,
          "Cylinders": 4,
          "Displacement": 108,
          "Horsepower": 70,
          "Miles_per_Gallon": 34,
          "Name": "toyota corolla",
          "Origin": "Japan",
          "Weight_in_lbs": 2245,
          "Year": "1982-01-01T00:00:00"
         },
         {
          "Acceleration": 15,
          "Cylinders": 4,
          "Displacement": 91,
          "Horsepower": 67,
          "Miles_per_Gallon": 38,
          "Name": "honda civic",
          "Origin": "Japan",
          "Weight_in_lbs": 1965,
          "Year": "1982-01-01T00:00:00"
         },
         {
          "Acceleration": 15.7,
          "Cylinders": 4,
          "Displacement": 91,
          "Horsepower": 67,
          "Miles_per_Gallon": 32,
          "Name": "honda civic (auto)",
          "Origin": "Japan",
          "Weight_in_lbs": 1965,
          "Year": "1982-01-01T00:00:00"
         },
         {
          "Acceleration": 16.2,
          "Cylinders": 4,
          "Displacement": 91,
          "Horsepower": 67,
          "Miles_per_Gallon": 38,
          "Name": "datsun 310 gx",
          "Origin": "Japan",
          "Weight_in_lbs": 1995,
          "Year": "1982-01-01T00:00:00"
         },
         {
          "Acceleration": 16.4,
          "Cylinders": 6,
          "Displacement": 181,
          "Horsepower": 110,
          "Miles_per_Gallon": 25,
          "Name": "buick century limited",
          "Origin": "USA",
          "Weight_in_lbs": 2945,
          "Year": "1982-01-01T00:00:00"
         },
         {
          "Acceleration": 17,
          "Cylinders": 6,
          "Displacement": 262,
          "Horsepower": 85,
          "Miles_per_Gallon": 38,
          "Name": "oldsmobile cutlass ciera (diesel)",
          "Origin": "USA",
          "Weight_in_lbs": 3015,
          "Year": "1982-01-01T00:00:00"
         },
         {
          "Acceleration": 14.5,
          "Cylinders": 4,
          "Displacement": 156,
          "Horsepower": 92,
          "Miles_per_Gallon": 26,
          "Name": "chrysler lebaron medallion",
          "Origin": "USA",
          "Weight_in_lbs": 2585,
          "Year": "1982-01-01T00:00:00"
         },
         {
          "Acceleration": 14.7,
          "Cylinders": 6,
          "Displacement": 232,
          "Horsepower": 112,
          "Miles_per_Gallon": 22,
          "Name": "ford granada l",
          "Origin": "USA",
          "Weight_in_lbs": 2835,
          "Year": "1982-01-01T00:00:00"
         },
         {
          "Acceleration": 13.9,
          "Cylinders": 4,
          "Displacement": 144,
          "Horsepower": 96,
          "Miles_per_Gallon": 32,
          "Name": "toyota celica gt",
          "Origin": "Japan",
          "Weight_in_lbs": 2665,
          "Year": "1982-01-01T00:00:00"
         },
         {
          "Acceleration": 13,
          "Cylinders": 4,
          "Displacement": 135,
          "Horsepower": 84,
          "Miles_per_Gallon": 36,
          "Name": "dodge charger 2.2",
          "Origin": "USA",
          "Weight_in_lbs": 2370,
          "Year": "1982-01-01T00:00:00"
         },
         {
          "Acceleration": 17.3,
          "Cylinders": 4,
          "Displacement": 151,
          "Horsepower": 90,
          "Miles_per_Gallon": 27,
          "Name": "chevrolet camaro",
          "Origin": "USA",
          "Weight_in_lbs": 2950,
          "Year": "1982-01-01T00:00:00"
         },
         {
          "Acceleration": 15.6,
          "Cylinders": 4,
          "Displacement": 140,
          "Horsepower": 86,
          "Miles_per_Gallon": 27,
          "Name": "ford mustang gl",
          "Origin": "USA",
          "Weight_in_lbs": 2790,
          "Year": "1982-01-01T00:00:00"
         },
         {
          "Acceleration": 24.6,
          "Cylinders": 4,
          "Displacement": 97,
          "Horsepower": 52,
          "Miles_per_Gallon": 44,
          "Name": "vw pickup",
          "Origin": "Europe",
          "Weight_in_lbs": 2130,
          "Year": "1982-01-01T00:00:00"
         },
         {
          "Acceleration": 11.6,
          "Cylinders": 4,
          "Displacement": 135,
          "Horsepower": 84,
          "Miles_per_Gallon": 32,
          "Name": "dodge rampage",
          "Origin": "USA",
          "Weight_in_lbs": 2295,
          "Year": "1982-01-01T00:00:00"
         },
         {
          "Acceleration": 18.6,
          "Cylinders": 4,
          "Displacement": 120,
          "Horsepower": 79,
          "Miles_per_Gallon": 28,
          "Name": "ford ranger",
          "Origin": "USA",
          "Weight_in_lbs": 2625,
          "Year": "1982-01-01T00:00:00"
         },
         {
          "Acceleration": 19.4,
          "Cylinders": 4,
          "Displacement": 119,
          "Horsepower": 82,
          "Miles_per_Gallon": 31,
          "Name": "chevy s-10",
          "Origin": "USA",
          "Weight_in_lbs": 2720,
          "Year": "1982-01-01T00:00:00"
         }
        ]
       },
       "encoding": {
        "color": {
         "field": "Origin",
         "type": "nominal"
        },
        "x": {
         "field": "Horsepower",
         "type": "quantitative"
        },
        "y": {
         "field": "Miles_per_Gallon",
         "type": "quantitative"
        }
       },
       "mark": "point",
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      },
      "text/plain": [
       "<VegaLite 3 object>\n",
       "\n",
       "If you see this message, it means the renderer has not been properly enabled\n",
       "for the frontend that you are using. For more information, see\n",
       "https://altair-viz.github.io/user_guide/troubleshooting.html\n"
      ]
     },
     "execution_count": 1,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "import altair as alt\n",
    "\n",
    "# load a simple dataset as a pandas DataFrame\n",
    "from vega_datasets import data\n",
    "cars = data.cars()\n",
    "\n",
    "alt.Chart(cars).mark_point().encode(\n",
    "    x='Horsepower',\n",
    "    y='Miles_per_Gallon',\n",
    "    color='Origin',\n",
    ").interactive()"
   ]
  }
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